Solar cooking appliances

ABSTRACT

Solar heat collector, especially an evacuated-tube solar heat collector, filled with first solid heat storage and conducting material transfers the solar heat to an electric power heat insulated utensil through second heat conducting/transferring material for cooking foods and making coffee/tea. A set of solar cooking appliance having a solar heat collector filed with a first solid heat storage and conducting material and a solar cooking range filled with third solid heat storage and conducting material. The solar cooking range having a heat insulated enclosed compartment and also having a cooktop. The cooking range having a set of cooking chambers which are in thermal contact with the first and second heat storage and conducting material for cooking food therein. The cooking appliance also has a group of removable parts that cover the cooking chambers separately. An electric power heater provides a backup energy source and electric heat storage.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is a continuation of International Application No.PCT/CA2010/001118 filed on Jul. 19, 2010, PCT/CA2010/001119 filed onJul. 19, 2010, and PCT/CA2010/001120 filed on Jul. 19, 2010, which thesePCT applications further claim priorities over the Canadian ApplicationNo. 2,672,760 filed on Jul. 23, 2009, Canadian Application No. 2,673,703filed on Jul. 23, 2009, and Canadian Application No. 2,673,702 filed onJul. 23, 2009, respectively. The entire contents of which areincorporated herein by reference.

FIELD OF TECHNOLOGY

The present disclosure relates to solar heat application field,especially related to solar cooking appliances to cook the foods in thesolar utensil thermally connected to a solar heat collector in whichsolid heat storage and conducting material is placed.

BACKGROUND

For all kinds of existing energy sources in the earth, solar energy isthe most widespread, the richest and the most uniformly distributedenergy source. Solar energy can be used very easily. It is availableevery day, everywhere and for everybody. For all kinds of human energyconsuming activities, food and beverage cooking is the most importantactivity and has the longest history. Therefore, it is very interestingand valuable topic to use solar energy for food cooking.

The solar radiation intensity is varied at different regions of earth,and also varied at different time during the day and different seasons.The solar radiation intensity also is affected by the weather, so thatto develop an economic effective solar cooking appliance is always achallenge and required continuous efforts.

To overcome the above mentioned difficulties, some of the solar cookingappliances employ a large sunlight receiving area. But the heatinsulation for the received heat presents another challenge. Some solarcooking appliances follow and focus the sunlight using an expensiveautomation system, which requires additional power to operate. Somesolar cooking appliances also use the heat storage materials, but thematerials may be expensive and not easy to get. There are two prior artsdisclose appliances having solar cooking function. They are Muller, Dr.HEINZ-JOACHIM, “Solar Steam Cooker”, 46^(th) ANZSES (Australia and NewZealand Solar Energy Society) conference [online], ISES-AP 2008 andJiang-Tian Zhao (Zhao, et al.) CN 201206904 Y, “Solar Water Heater”,March 2009 (Nov. 3, 2009). Both applied the evacuated tube solar heatcollector to heat water or to provide steam for food cooking. So thecooking temperature is limited at the water boiling temperature.

At present time, electric power demand management becomes more popular.One of the management methods is to store the electric heat at the lowerpower demand period for using at the high demand period. The solarcooking range/stove of this disclosure has very good heat insulation andcan be a large heat energy storage device. So the solar heat range/stovecan also be an electric heat storage container for electric power demandmanagement purpose.

Therefore, it is an important topic for the industry to further developand improve applications of the solar cooking technology to develop aset of economic and practicable solar cooking appliances.

SUMMARY

The object of this disclosure is to improve the existing technologiesand provides a set of solar cooking appliances that is cost effective,easy to manufacture, use and with high efficiency.

The invention takes following steps to overcome the difficulties ofapplying solar energy for food cooking:

To use the evacuated solar heat collector for optimum heat collecting.To cook the foods within solar heat collector for optimum heat storage.

To filled solid heat storage and conducting material in the evacuatedsolar heat collector for storing, keeping heat and transferring solarheat to an electric powered solar cooking utensil or a range/stove. Itnot only provides a continue and stable cooking heat, solar cookingutensil. A light reflector focuses the surrounding light to the cookingappliances. A sundial indicates the light direction, an adjustable androtatable fixing and supporting trestle allows to receiving the highestsolar power. An electric power supply provides a backup power sourcewhen the solar power is not sufficient. Furthermore, the solar cookingappliances also provide electric energy storage equipment to store heatduring the low electricity price period, such that the solar cookingappliances can provide cooking and heating during the high electricpower price period or at power outage.

Following are the detailed summary of present disclosure.

In accordance with one aspect of the present disclosure there isprovided a solar cooking appliance, comprising: a solar heat collectorfor collecting and storing solar heat; a first solid heat storage andconducting material for storing and conducting solar heat, wherein saidsolid heat storage and conducting material placing within said solarheat collector, wherein said solar heat collector can heat said solidheat storage and conducting material to a temperature higher than thewater boiling temperature; a heat insulated solar cooking utensilpositioned out of the solar heat collector, having a cooking utensil anda heat insulation, wherein said heat insulated solar cooking utensil isa heat insulated electric power cooking utensil to provide electricityas a backup heat source; and a second heat-transferring/conductingmaterial connected thermally said first solid heat storage andconducting material to said heat insulated solar cooking utensil fortransferring solar heat from said solar heat collector to said heatinsulated solar cooking utensil; wherein said heat insulated solarcooking utensil is selected from a group of: a heat insulated electricpower cooking utensil having said first solid heat storage andconducting material filing between said cooking utensil and said heatinsulation, wherein said first solid heat storage and conductingmaterial is connected to said second heat-transferring/conductingmaterial; a heat insulated electric power cooking utensil to provideelectricity as a backup heat source, having a fitting to receive thesaid second heat-transferring/conducting material directly fortransferring the solar heat from said solar heat collector to saidcooking utensil; and an evacuated electric power cooking utensil made ofa material selected from a group of: glass, metal, synthetic, andceramic.

In accordance with another aspect of the present disclosure there isprovided a solar cooking appliance, comprising: a solar heat collectorfor collecting and storing solar heat; a first solid heat storage andconducting material for storing and conducting solar heat, wherein saidfirst solid heat storage and conducting material placing within saidsolar heat collector, wherein said solar heat collector can heat saidsolid heat storage and conducting material to a temperature higher thanthe water boiling temperature; an electric power supply providing abackup heat source, comprising: an electric heat element located underthe airtight reservoir and within heat storage and conducting material;a heat insulated solar cooking utensil positioned outside of the solarheat collector; and a second heat transferring/conducting materialcomprising: an airtight reservoir containing a liquid and located in thesolar heat collector; a liquid conduit having a first end and a secondend, and said first end extended into said airtight reservoir andsubmerged into said liquid, and said second end is inserted into saidheat insulated solar cooking utensil, and said liquid is selected from agroup of: water and oil.

In accordance with another yet one aspect of the present disclosurethere is provided a set of solar cooking appliances, comprising: a solarheat collector to collect and store solar heat, a first solid heatstorage and conducting material filled in the solar heat collector, saidsolar heat collector can heat said solid heat storage and conductingmaterial to a temperature higher than the water boiling temperature; asolar cooking range/stove having a heat insulated and enclosedcompartment and a cooktop covering top surface of said solar cookingrange/stove, a third solid heat storage and conducting material filledin the heat insulated and enclosed compartment of said solar cookingrange/stove, and said solar cooking range/stove thermally connected withsaid solar heat collector to receive and store solar heat for foodcooking, a set of cooking chambers arranged in said enclosed compartmentand located in said second heat storage and conducting material, asecond heat-transferring/conducting material thermally connected saidsolar heat collector to said third heat storage and conducting materialwithin said solar cooking range/stove for transfer the solar heatfaster, a set of cooking utensils with heat insulated lids, said cookingutensils located in the cooking chambers of said solar cookingrange/stove, a set of removable parts for covering said cookingchambers, a set of removal parts for inserting said cooking chambers, anelectric power heater arranged in said range/stove to provide a backupenergy source and electric heat storing,

Other aspects and features of the present disclosure will becomeapparent to those ordinarily skilled in the art upon review of thefollowing description of specific embodiments of the invention inconjunction with the accompanying figures.

BRIEF DESCRIPTION OF THE DRAWINGS

The advantages and spirit related to the present invention can befurther understood via the following detailed description and drawings.

FIG. 1 is a schematic side view of a set of exemplary solar cookingappliances comprising a solar cooking range/stove, a set of cookingutensils and a solar heat collector filled with solid heat storage andconducting material.

FIG. 2 is a perspective view that illustrates schematically a set ofsolar cooking appliances comprising the backup electric heatingelements, operation parameter indication and control system.

FIG. 3 is a schematic diagram illustrating an exemplary solar coffee/teamaker in vertical section view.

FIG. 4 is a schematic diagram illustrating another exemplary solarcoffee/tea maker in vertical section view.

FIG. 5 illustrates schematically an alternative solar cooking appliancein vertical section view that transfers the solar heat by the directconnection.

FIG. 6 illustrates schematically another solar cooking appliance invertical section view that uses heat tubes as the heat-transferringmedium.

FIG. 7 is a schematic diagram multi mounted solar heat collectors and ofa set of cooking utensils that can connect to the heat collectors toform the solar cooking appliance.

FIG. 8 illustrates a set of exemplary solar heat collectors in variousformations and material.

DETAILED DESCRIPTION

Referring to FIG. 1, a set of exemplary solar cooking appliances 100 isillustrated in schematic side view during use. Wherein a solar heatcollector 110 is illustrated schematically in partial cross section viewand a solar cooking range 130 is illustrated schematically in verticalsection view. The solar cooking appliances 100 comprises the solar heatcollector 110 filled with a first solid heat storage and conductingmaterial 120, the solar cooking range 130 filled with third solid heatstorage conducting material 122, the solar cooking utensils 151, 152,153 and accessories. A second heat conducting/transferring material 121transfers solar heat from solar heat collector to the solar cookingrange 130.

In this case, the first and third solid heat storage and conductingmaterials 120 and 122 are the same material. It is sand. They may bedifferent kinds of solid heat storage and conducting materials, e.g.salt and sand. They also can be different kinds of solid heat storageand conducting materials. The second heat conducting/transferringmaterial is heating oil 121. One open end 118 of solar heat collector110 is extended into solar cooking range 130. The heating oil 121connects and submerges in the sands 120 and 122. It transfers the solarheat from 121 to 122. Furthermore, the heating oil circulatesautomatically in solar heat collector 110 and the enclosed compartment131 of range 130.

For a solar cooking appliance the solar heat collector may be any kindof solar heat collector. In this case it is a plurality of moduleevacuated tube solar heat collector. Usually the evacuated solar heatcollector has a better heat insulation feature to keep the stored solarheat. The solar heat collector has to be able to heat the first solidheat storage and conducting material 120 and the third solid heatstorage and conducting material 122 to a temperature higher than thewater boiling temperature. This disclosure introduces the first andthird heat storage and conducting materials to store solar heat in thesolar heat collector, solar cooking utensil and solar cooking range. Sothe first and third heat storage and conducting materials have a workingtemperature higher than the water boiling temperature. Therefore thesolar cooking appliance can work at a temperature higher than waterboiling temperature. The first and third heat storage and conductingmaterials can provide the stored heat for cooking at the water boilingtemperature continuously and stably even if the sunlight is temporarynot available.

In FIG. 1, the solar heat collector is a plurality of modularevacuated-tube solar heat collectors 111, 112, 113, 114, 115 and 116that extend their one open ends into a conflux tube 117 and are mountedin a parallel row. Depending on the cooking requirements, the group ofmodular evacuated-tube solar heat collectors may be mounted in othershapes like a cone column etc. The number of the tubes is also dependedon the cooking demand and may vary. The one end 119 of the solar heatcollector 110 is closed and another end 118 is an open end extended intothe enclosed compartment 131 of the solar range 130.

The evacuated-tube solar heat collectors 111-116 have a transparentouter layer 1111 and inner layer 1112 and are evacuated in between. Theinner layer 1112 has a heat absorbing coating (not show in the FIG. 1).The evacuated-tube solar heat collector can be purchased in market. Theyare usually used for solar heating water.

The solar heat collector that can be used in solar cooking appliancescan have many different structures. They are illustrated schematicallyin FIG. 8.

The evacuated-tube solar heat collector is made of glass. In case theglass tube is broken, the broken glass pieces are dangerous for theuser. So the solar heat collector may need a transparent cover forsafety reasons. (not shown in FIG. 1). The transparent cover may be aplastic cover. It can be either the mantles for each tube or aprotective cover for an entire collector panel. But the plasticprotective mantles may reduce the efficiency of the solar heatcollector. So an evacuated toughened-glass tube solar heat collector isa better solution, if it is available.

The first solid heat storage and conducting material 120 is filled inthe solar heat collector 110. In this case, it is sand. The third heatstorage and conducting material 122 is filled in the enclosedcompartment 131 of the solar cooking range 130. In this case, it is sandtoo. In many cases the first and third heat storage and conductingmaterials can be the same one material and simply called first solidheat storage and conducting material. It also can be two differentmaterials. For example when the third solid heat storage and conductingmaterial is filled in a heat insulated utensil, we prefer to use thecooking salt for a safety reason and use the sand in the solar heatcollector for a cost reason. The second heat conducting/transferringmaterial 121 is filled in both solar heat collector 110 and solarcooking range 130. In this case it is heating oil. The heating oil 121transfers the solar heat by liquid circulation. In fact, we can alsotake out the heating oil and leave the sand only in the solar cookingappliance. In this case we may need count the inner walls of the solarheat collectors and the solar cooking range as part of the second heatconducting/transferring material.

The requirements of first and third heat storage and conductingmaterials are mainly as following: high ratio of heat capacity, highheat conductivity, safe for use, cheap and easy to get. As mentionedbefore, to make sure a continued and stable cooking, we also require theheat storage and conducting material can be heated to a workingtemperature higher than the water boiling temperature. So it is notnecessary for the solar heat collector 110 to use the materials onlymentioned above. There are many materials can become the first and thirdsolid heat storage and conducting materials, whatever it is a simplesolid material, a chemical solid material, or it is a combination ofabove mentioned materials. A claim lists a group of the heat storage andconducting materials. Each material has its advantages and disadvantagesthat need us to consider. Following are some notes to the examples ofthe claim:

Many of the solid material are good heat storage and conducting materialwith some disadvantages. The quartz sand is a kind of ore. It is a safe,cheap, easy to get material, but its heat conductivity is low. Graphiteis a kind of ore too. It has good heat conductivity, but is moreexpensive than quartz sand. Coal and turves are two kinds of fossil andhave good heat conductivity, but their heat capacity ratio is not veryhigh. Metal (e.g. steel, copper aluminium etc.) and alloy (e.g.stainless steel, copper or aluminium alloy etc.) have good heatconductivity and are easy to manufacture in different shapes, but theyare expensive. Sand and soil are easy to get and very cheap anywhere,but the components of sand and soil are varied from one place toanother.

The liquid can store heat and the flowing liquid transfers the heateasily. Water and oil are two typical liquids. The prior solar cookingappliances use water in the hot water tank or water steam directly froma solar heat collector to cook the food. In our disclosure, the water isnot considered as a solar heat storage and conducting material. Becauseit's maximum working temperature is the boiling temperature, so it can'tprovide a continued and stable heat source for food cooking. Water has avery high heat capacity ratio. The water under high pressure can have ahigh boiling temperature for using in solar cooking appliances. Thepressured water is one of the heat storage and conducting material ofthis disclosure. Special attention needs to put to the safety measuresof the pressured water.

The boiling temperatures of many kinds of oil are usually higher thanthe water boiling temperature. The cooking oils such as colza oil, beanoil, peanut oil, tea-seed oil etc. are safe to eat. They are good to bethe heat conducting materials. The petroleum and its products such asheating oil, fuel oil, transformer oil and diesel have much higherboiling temperature than water. They are cheaper than cooking oils andare good heat transferring materials too. One of the disadvantages ofthese kinds of oils is not safe when the solar cooking appliance is overheated or work with an electric heat element. Furthermore somevolatilized materials of these kinds of oils may be not good for hearth.The cooking oil is a human food. Except in some special cases, we do notsuggest to use cooking oil as a heat storage and conducting material.

Many kinds of the solid chemical heat storage materials can become heatstorage and conducting materials such as a multi-water chemical or aparaffin. They may have special advantage of a high heat capacity ratio.We also need to protect their potential harm effect that may be causedafter a long period of the operation.

The combination of two or more kinds of above mentioned materials areoften used. For example plumbaginous paraffin (graphite and paraffin)have good heat conductivity from graphite and phase change heatcapability from paraffin. To fill the oil into sand, it not only savethe oil and make it more safety, but also have good heat transferringcapability from the oil flow.

The purpose of the long list of the claim 4 and above detaileddiscussion is to prove that there are so many materials in the world canbe used as the solar heat storage and conducting materials. We have tofind and use the best local materials for solar cooking appliances. Thisis not only necessary for save energy and cost, but also possible in thetechnical point of view.

The solar range 130 includes an enclosed compartment 131 wherein thethird solid heat storage and conducting material 122 is filled. It alsoincludes the heat insulation layer 132, cooktop 133, and a hole 134 onthe cooking top with a fitting 135. The hole 134 is for air breathingand the expansion of the second solid heat storage and conductingmaterial. Within the range 130, several chambers 136, 137, 138 and 139are arranged. They provide the locations for the utensils.

The enclosed compartment 131 usually is closed by a metal e.g. stainlesssteel plate. It also can be a steel, a copper or an aluminium alloy. Themetal is easy for processing and easy to make an airtight box. It isimportant to use metal for a liquid container. For the cost or otherreason, a different material can replace the metal. They are selectedfrom the group of a plastic, a ceramic, a concrete, a brick, a stone, awood, a bamboo, a soil and any hybrid combination of above mentionedmaterials and metals. The use of non-metal materials not only is cheaperbut also save the energy used to manufacture a metal.

The heat-insulated layer 132 on the surface of the solar cooking rangeis a heat-insulated coating, e.g. ceramic coating in this case. It alsocan be a removable heat insulated greatcoat. A cooktop 133 covers thetop of the range on the surface of the heat insulation coat.

A smaller closed part 140, usually named as oven, is located in thesolar cooking range 130. The oven 140 is closed by heat conductive metal141, e.g. stainless steel or copper sheet. The oven is surrounded by thesecond heat storage and conducting material 122. The oven 140 has a heatinsulated door 1401 with a watching eye 1403 at a side wall of saidsolar cooking range and a handle 1402. The oven 140 further includes aremovable drawer (not shown in FIG. 1) filled with the third heatstorage and conducting material 122. It locates in the oven 140 when theoven is out of service to add the heat capacitance of the range.

In the solar cooking range 130, the cooking utensils 151, 152, 153 and154 are inserted within the chambers 136, 137, 138, 139 respectively forfood cooking. These chambers are formed within the second heat storageand conducting material 122. In FIG. 1, we can see that the walls 1361,1381 and 1391 of chambers 136, 138 and 139 are in cylinder bucket shape,and 1371 is in hemisphere shape. The chambers have their open tops onthe cooktop 133. The cooking chambers 136, 137, 138, 139 are enclosed byheat conductive material, e.g. stainless steel or copper for separatingthe heat storage and conducting material from the cooking utensil. Theremovable parts 1516, 1521 (not shown in FIG. 1), 1531, 1541 cover thechambers 136, 137, 138 and 139 for heat insulation purpose. There arefour heat insulation blocks prepared for each chamber (in FIG. 1 only1392 is shown). They are prepared for inserting in the chambers whensome cooking chambers are out of service. The heat insulation block istaken out when a chamber is in use.

In FIG. 1, the cooking utensils 151, 152, 153 at the solar cooking range130 represent some different kinds of the solar cooking utensils.

The utensil 151 is a deep fryer in cylinder bucket shape. A fry basket1518 is located inside of the utensil. Its lower part inlays in cookingchamber 136 and its wall 1511 has a closed heat connection with thechamber wall 1361. The upper part of utensil 151 is heat insulated by aheat insulation greatcoat 1513. A heat insulation cover 1516 covers thelid 1515. There is a detachable handle 1517 inside of utensil 151.

The utensil 152 is a pot or wok in hemisphere shape to match the sizeand shape of the chamber 1371. It is inlayed fully in the chamber 137.It has a two layers toughness glass lid 1373 with a hole 1372 for steamleaking.

The utensil 153 is a steamer in cylinder bucket shape. A two layerssteamer basket 1533 is arranged within the steamer. It inlays in cookingchamber 138 and has a closed heat connection with the chamber wall 1381.A heat insulation cover 1531 covers the lid 1532. There is a detachablehandle 1534 inside of utensil 153.

Based on above detailed descriptions, we can find that the commonfeatures of these solar cooking utensils are as follows:

-   -   A. The body of the utensil is mainly in cylinder bucket shape or        in hemisphere shape.    -   B. The utensils are inlayed fully or partially in the cooking        chambers of solar cooking range and have a closed heat        connection with the chamber walls.    -   C. The utensil's parts out of the chamber are heat insulated.    -   D. The lid of the utensil is heat insulated, either by a cover        or has two layers.

In other cases, the solar heat collector may be a mounted panel. It mayhave two ends extended into the range. It may also connect the one endor two ends through conduit(s) with the range and transfer the solarheat from the solar heat collector 110 to the solar cooking range 130.

FIG. 2 is a perspective view that illustrates schematically a set ofalternative solar cooking appliances 200 including the backup electricheating elements, measuring, indicating and controlling system.

Referring to FIG. 2, a set of solar cooking appliances includes a solarheat collector 210, a solar cooking range 230, two liquid conduits 215and 216 connected the solar heat collector 210 with the heat exchanger225. The heat exchanger is equipped in the solar cooking range 230. Thesolar heat collector 210 is a modular panel mounted by 5 evacuated-tubesolar heat collectors having its inlet 211 and outlet 212. The firstsolid heat storage and conducting material 220 is filled in the solarheat collector 210. In this case it is sand.

The solar cooking range 230 includes an enclosed compartment 231 with aheat insulation coat (not shown in FIG. 2). The third solar heat storageand conducting material 222 is filled in the solar cooking range 230.(not shown in FIG. 2). In this case it is turves. (not shown in FIG. 2).An oven 232 is arranged in 231 with a handle 2321 and a watching eye2322. The oven 232 further includes an equipped upper electric heatelement and/or a lower equipped electric heat element with power supplyas a backup energy source. (not shown in FIG. 2)

Three chambers 233, 234 and 235 are located in the solar cooking range230 and surrounded by the third heat storage and conducting material222, it is turves. Three electric heat elements 267, 268 and 269 areequipped in the bottoms of the chambers 233, 234 and 235 respectively.The electric heat elements 267, 268 and 269 have their power supply andswitchers 261, 262, and 263. The switchers 261, 262 and 263 and the datarotating indicators 264, 265 and 266 including control system arearranged on the control panel 260.

Three chambers 233, 234 and 235 have the standard module size and shape.Each solar cooking utensil used for the solar coking range 230 has aheat conductive coat sized to fit its inside size and shape with theoutside size and shape of said utensil, and its outside size and shapewith the inside size and shape of said standard module cooking chamber.So that even each utensil may have different shape and size, everyutensil with its coat can located in any one of the standard chamber inthe range 230. Furthermore each solar cooking utensil that used for thesolar coking range 230, has a heat insulated coat sized to fit itsinside size and shape with the outside size and shape of said utensil,and its outside size and shape with the inner size and shape of saidstandard module cooking chamber in said solar cooking range. So thatwhen the electric heat element is in operation, the heat element heatsone utensil and cooks the food in the utensil only. The electric powerdoes not need to heat all the heat storage and conducting material inthe solar cooking range 230.

A heat exchanger e.g. a fin tube 225 locates in the solar cooking range230 and connects its two ends to two fittings 2251 and 2252 on thesurface of the solar cooking range. The conduit 215 has one end connectsto the fitting 2251 and the opposite end connects to an end 211 of thesolar heat collector 210. The fitting 2252 is connected to an end of theconduit of 216. The opposite end of 216 connects the end 212 of solarheat collector 210.

The liquid second heat conducting/transferring material, i.e. fuel oil,is filled in heat exchanger 225, conduits 215 and 216. It is permeatedin the sand within solar heat collector 210. The other accessories mayneed to circulate the liquid such as the pump are not discussed andshown in the FIG. 2.

When the sunlight 201 shines on the solar heat collector, the collectorabsorbs the heat and stores the heat in the sand. The second heatconducting/transferring material, i.e. fuel oil picks up the heat andcarrys it through a close-loop 211-2251-2252-212-211 and transfers theheat to the turves in the solar cooking range 230. The cooking utensils233, 234 and 235 pick up the solar heat through the heat connection withthe walls of the chambers to cook the foods. When the solar power is notenough for the cooking, the electric heat elements 267, 268 and 269provide the additional energy as a backup power source.

The solar cooking appliances 200 further include a fixing and supportingtrestle 217 that arrange and support the five solar heat collectors atthe proper locations and situations. It allows the adjustment of theincidence angle of the solar heat collector 210 to the sunlight. Fourwheels 271, 272, 273 and 274 are installed in the four bottom corners ofthe supporting trestle 217 for adjust the direction of the solar heatcollector 210. A sundial (not shown in FIG. 2) is a cone bar. Itattaches to the solar heat collector perpendicularly for indicating theincidence angle of the sunlight. A light reflector (not shown in FIG. 2)is equipped under the evacuated-tube for focusing the surrounding sunlight to the solar heat collector.

The solar cooking range 230 further includes an empty hot water tubeburied in the third heat storage and conducting material and has itsinlet fitting 237 and outlet fittings 238 at the wall of the range 230.When the range is cooking, the tube is empty. After the cooking or whenrequire a hot water or steam, cool water is flowed through the tube inthe range 230 to make hot water or steam.

Referring to FIG. 3, a schematic exemplary solar coffee/tea maker 100 isillustrated in vertical section and cross section view during use. Thesolar coffee/tea maker 100 includes a solar coffee/tea pot 160, a solarheat collector 110 and their connecting conduit 171. The solar heatcollector 110 is filled with first solid heat storage and conductingmaterial 120.

The solar coffee/tea pot 160 is a liquid container with a lid 162. Inthis case it is a vacuum glass bottle 161. But the stainless steel andsynthetic material are also often be used. A coffee/tea holder 166 isdisposed in the pot 160. The coffee/tea holder 166 has its lower part oftea basket 167 with removable lid 1671. The upper part of the coffee/teaholder 166 is a punched coffee holder 168. A stand 169 supports thecoffee holder 168 and tea holder 167. All three parts of coffee holder,tea holder and its lid can be moved through the axis 169. Based on thecooking requirement, either coffee holder or tea holder or both of themcan be stayed in or removed out from the pot 160.

A hot water shower head 164 is arranged at the center of lid 162. A hotwater conduit 163 passes through and is hidden in the lid 164 and thehandle 165 of the pot 160. The hot water conduit 163 connects the watershower head 164 at one end. The opposite end of the hot water conduit163 is connected to a fitting 170 that is at a lower part of the handle165. The fitting 170 is for receiving a hot water conduit 171 from asolar heat collector 110. Solar heat collector 110 may be any kind ofsolar heat collector that can heat the first solid heat storage andconducting material 120 to the temperature more than the water boilingtemperature. In this case the solar heat collector 110 is anevacuated-tube solar heat collector. It may also be a group of modularevacuated-tube solar heat collectors mounted in a certain shape, e.g. inparallel row or in full or partial cone-shaped column as of the examplesshown in FIG. 7. The solar heat collector 110 has a removable part 114with two holes 1141 and 1142. The hole 1141 is a path for power cable151 and air exchange. The hole 1142 is to continue the hole 1311 for ahot water conduit 171 to go through.

The evacuated-tube solar heat collectors 110 has transparent outer layer111 and inner layer 112. It is evacuated in between. The inner layer 112has a heat absorbing coating that does not show in the FIG. 3. Theevacuated-tube solar heat collector 110 has the same material andmanufacture processing as the evacuated-tube solar heat collector thatused for solar water heating. But the evacuated-tube solar heatcollector 110 used in solar cooking has a larger diameter and a shorterlength comparing to the regular evacuated-tube for solar hot water.

The evacuated-tube solar heat collector 110 is made of glass. In casethe glass tube is broken, the glass piece is dangers for the user. Sothe solar heat collector 110 has a transparent cover e.g. a plasticcover for safety reason. (It is not shown in FIG. 1). If the solar heatcollector 110 is a group of evacuated-tubes mounted in row, thetransparent cover e.g. plastic cover may cover each tube or a plasticprotective mantle may cover entire raw. But the plastic protectivemantle may reduce the efficiency of the solar heat collector 110. So anevacuated toughened-glass tube solar heat collector is a bettersolution.

The evacuated-tube solar heat collector 110 is filled with a first solidheat storage and conduction material 120. The first solid heat storageand conducting material 120 in this case is salt or stone sand forstoring and transferring the solar heat to the water container 130. Infact, many kinds of the materials can be used as the solar heat storageand conducting material. For example, they are solid materials such assalt, sand, graphite and turves. They also can be solid phase changematerial, such as paraffin. The combination of different materials, suchas bean oil in quartz sand.

The water container 130 is a cylinder container located inside of solarheat collector 110 and above the first solid heat storage and conductingmaterial 120. It made of stainless steel. The water container 130 has aremovable part 131 with a hole 1311, it is a stopper inserted in 130.The container has a diameter near but not bigger than the inner diameterof the evacuated-tube 110. A pleated structure 133 is on the wall of thecontainer from the top to the bottom to provide a gap and patch for airexchange and power cable 151. Furthermore, it allows a minor adjustablediameter for the container 130. The cooking utensil 130 further includesa removable and detachable handle 134 at the inner wall for removing thecontainer 130 from the solar heat collector 110.

A removable part 114 covers the top of solar heat collector 110. It hastwo holes 1141 and 1142. The first hole 1141 connects to said gap andpath for air exchange and power cable. The second hole 1142 continuesthe hole 1311 in the stopper 131 of the container 130.

The electric heat element 150 with power supply is a very low powerelectric heat element. It located under the water container 130 andwithin heat storage and conducting material 120. A power cable 151 hasvery high resistive heat temperature that connects the electric heatelement to power supply plug 152 outside of the solar heat collector110, through the path formed by a pleated structure 133 on the walls ofthe utensil 130. The electric heat element 150 may further includes ameasuring, indicating and controlling systems for the solar cookingappliances operating characteristic parameter, e.g. timing, temperature,pressure, moisture etc. These are not shown in FIG. 1. The electric heatelement with power supply can be removed from the set of cookingappliance. In this case the set of solar cooking appliances is still acomplete cooking appliance that use solar heat as only energy source.

A hot water connecting conduit 171 is extended into said airtight solarheated water container through the holes 1142 and 1311. Its one end issubmerged under the water level 135 in heated water container 130. Theopposite end of said hot water connecting conduit 171 is connected witha conduit connecting fitting 170 at said handle 165 of the coffee/teapot 160.

When the solar light 101 shines on the solar heat collector 110, thesolar heat collector absorbs the solar heat and stores it in the sand120. When the water container 130 is put into the solar heat collector110 and the cool water is poured in, the solar heat is transferred tothe solar water container 130 through the inner wall 112, heated sand120 and heats the water. The conduit 171's end 1711 is submerged underthe water level 135 in water container 130. The water container 130 isairtight. When the water is heated to boiling, the water steam gatheredin the upper space of the container 130 forces the hot water flows upthe conduit 171 and 163. Then the hot water is dispersed to drip evenlyon the coffee grounds waiting on the coffee holder 168 through theshower head 164. The hot water picks up the coffee essence and down intothe coffee bottle 161. A coffee making processing is completed. Asimilar processing can be used for making tea. In this case the tea ortea bag can be put in the tea basket 167.

We can also replace the water container by using the evacuated-tube 110itself. In this case, there are no water container 130, its stopper 131and heat storage and conducting material 120 inside of the solar heatcollector 110. The removable part 114 needs to make the collector 110becomes an airtight container. When the solar heats the water in theevacuated tube 110 to boiling, the water steam in the evacuated tube 110presses the water upward and through the conduit 171 and 163 to makecoffee. In this case the speed and quantity of coffee making aredependent on the real time solar power. It may be not continued andstable. When we use the water container 130 located in a evacuated tube160 filled with first solid heat storage and contacting material 120, wecan use the stored heat to make coffee and tea at any time continuouslyand stably.

When the solar heat is not enough for cooking, electric element 150heats the water container inside of the solar heat collector 110.Because the tube 110 has very good heat insulation feature, so therequired electric power is very low. In this case, the electricity hasvery high cooking efficiency. Based on the idea of a solar coffee/teamaker mentioned above and in FIG. 3, a solar/electric coffee maker canbe easily manufactured by making a minor change to an electric heateddrip coffee maker or by reequipping an existing electric heated dripcoffee maker.

Referring to FIG. 4, a schematic solar/electric coffee maker 200 isillustrated in vertical section view. To make the description simpler,the solar heat collector 110 including the filled heat storage andconducting material 120, the solar water boiler 130 and the connectionconduit 171 are the same as mentioned in FIG. 3.

An electric coffee maker 260 has its cool water reservoir 261, electricheated tube 262, hot water tube 263, hot water shower head 264, punchedcoffee holder 265, coffee pot 266 and first one-way valve 267. Theseparts mentioned above are as the regular parts that any electric dripcoffee maker may have. Comparing to the regular electric drip coffeemaker, the major changes of a solar/electric coffee maker are as thefollowing: a hot water tube 263 continues the electric heated tube 262and leads the water up from the base of reservoir 261 to the drip area265. This hot water tube 263 has a bypass tube 268 located upper thefirst one-way valve 267 and electric heated tube 262, but lower theshower head 264; a second one-way valve 270 for preventing hot waterflowing backward to solar heat collector 110 is added. Its one endconnects to the end of said bypass tube 268 and its opposite endconnects to a connecting fitting 269 at said electric drip coffee maker260 through third tube 272. The connecting fitting 269 is for receivinga hot water tube 171 from a solar water container 130.

A third one-way valve 273 is equipped at the hot water tube 263 betweenthe bypass 268 and electric heated tube 262 for preventing hot waterfrom solar heat collector flows toward electric heated tube 162; a hotwater connecting conduit 171 is extended into said airtight solar heatedwater container 130 through the holes 1142 and 1311. Its one end issubmerged under the water level 135 in heated water container 130. Theopposite end of said hot water connecting conduit 171 is connected withsaid conduit connecting fitting 269 at electric drip coffee maker 260.

When the solar light 101 shines on the solar heat collector 110, thesolar heat collector absorbs the solar heat and stores it in the heatstorage and conduction material 120. When the water container 130 is putinto the solar heat collector 110 and the cool water is poured in, thesolar heat is transferred to the solar water container 130 through theinner wall 112, heat storage and conducting material 120 and heats thewater. The conduit 171's end 1711 is submerged under the water in thewater container 130. The water container 130 is airtight. When the wateris heated to boiling, the water steam gathered in the upper space of thecontainer forces the hot water flows up the conduit 171 and 263. Thenthe hot water is dispersed to drip evenly on the coffee grounds waitingon the coffee holder 165 through the shower head 264. The hot waterpicks up the coffee essence and down into the coffee port 266. A coffeemaking processing is completed. When solar heat collector 110 works, theadded one-way valve 273 prevents the water flows toward electric heatedtube 262.

When the solar energy is not enough, plug the electric heated tube 162.The cool water from 261 flows through the first one way valve 267 and isheated in electric heated tube 262 until boiling. The bubble in boiledwater forces the hot water up to the shower head 264 through hot watertube 263 to make coffee. The processing is the same as the processing inany kind of electric drip coffee maker.

When solar heat collector 110 works, the one-way valve 273 prevents thewater flows toward electric heated tube 262. When electric drip coffeemaker 260 works, the added one-way valve 272 prevents the water flowstoward solar heat collector 110. If necessary, two heating sources alsocan work together. As mentioned in FIG. 1, an empty solar heat collectortube 110 can replace the hot water container 130 to heat the water andmake coffee.

FIG. 5, illustrates schematically a set of solar cooking appliances 500in vertical section view that uses a heat tube as the second heatconducting/transferring material. The solar heat collector 510 is agroup of 5 modular evacuated-tube solar heat collectors that mounted ina row. The number of the modular evacuated-tubes in this embodiment is5, but it can be changed based on the cooking requirement. The solarheat collector 510 is filled with turves 520 in both converge tube 516and the evacuated tubes 511, 512, 513, 514, and 515. An electric powersolar cooking utensil has a utensil 561 located in a heat insulationgreatcoat 562. It has a two layer glass lid 563 with a hole 5631. Afitting 565 is arranged for receiving a heat tube 530 from the solarheat collector 510. The heat tube 530's one end is inserted into theconverge tube 516. The opposite end 531 of the heat tube 530 is insertedinto the fitting 565 in the cooking utensil 561. The two end of theconverge tube 516 are closed and heat insulated. When the solar heatcollector 510 is at work, the evacuated tubes absorb the heat and storeit in the turves in the solar heat collector 510. The heat tube 530transfers the solar heat to the cooking utensil 561 for food cooking.After cooking, the utensil 561 is removed from the heat insulationgreatcoat and a heat insulation mass is inserted in the heat insulationgreatcoat. It is to keep the solar cooking system in a high workingtemperature for next cooking.

FIG. 6 illustrates schematically an alternative solar cooking appliance600 in vertical section view. The appliance transfers the solar heat bydirectly connecting the graphite 620 in a solar heat collector 610 tothe graphite under an solar cooking utensil 661. For a faster solar heattransferring, a second heat conducting/transferring material 630 isadded in between the solar heat collector 610 and the space 665. 630 maybe a heat tube. The solar heat collector 610 is an evacuated-tube solarheat collector filled with graphite 620. An electric powered solarcooking utensil 660 has a cooking utensil 661 with a lid 663. Utensil661 is located in a heat insulation 662 with a lid 664. There is a space665 between the bottom of the cooking utensil 661 and the insulation662. A first solid heat storage and conducting material is filled in thespace. It can be same graphite or different kind of first solid heatstorage and conducting material. In this case it is graphite too. Theend of the evacuated tube 610 is extended into the space 665. Thegraphite 620 in solar heat collector 610 and the graphite in the space665 are connected closely. When solar heat collector is at work, thecollected solar heat is transferred from the graphite 620 in theevacuated tube 610 to the graphite in the space 665 by both graphite andheat tube. The solar heat cooks the food in the cooking utensil 661.Usually the evacuated-tubes mounted in a raw for cooking several foodsat the same time.

Referring to FIG. 7, a set of solar cooking appliances 700 withdifferent cooking utensils is illustrated schematically in perspectiveview and vertical section view. Five evacuated tube solar heat collector701, 702, 703, 704 and 705 are mounted in a parallel raw illustrated inperspective view. Five solar cooking utensils including the coffee/teamaker 7160, the electric coffee maker 7260, the steamer 7460, and theelectric power solar cooking utensils 7560 and another electric powersolar cooking utensils 7660 are put at one side of the solar heatcollector 710, and are illustrated in vertical section view. Each solarheat corrector is filled with different heat storage and conductingmaterial and has different way to connect the utensil as describedpreviously.

All of them have been described in details in the FIG. 3, FIG. 4, FIG.5, FIG. 6 and FIG. 7. The only different is that in FIG. 7, number “7”is added to each element number of each solar cooking utensil. Forexample, the solar cooking utensil 160 in FIG. 1 has a new number 7160in FIG. 7. The rest may be deduced by analogy. We'll not repeat thedescriptions again.

A fixing and supporting trestle 706 arranges and supports the five solarheat collectors at the proper locations and situations. The movablesupport 707 allows an adjustment of the incidence angle of the solarheat collector 710 to the sun light. Four wheels 741, 742, 743, and 744(743 and 744 are not shown in FIG. 7) are placed at the four bottomcorners of the supporting trestle 706 for adjust the direction of thesolar heat collector 710. An optional sundial (not shown in FIG. 7) is acone bar, which attaches to the solar heat collector 710perpendicularly, can be employed for indicating the incidence angle ofsunlight. An optional light reflecting object (not shown in FIG. 7) canalso be positioned under the evacuated-tube for focusing the surroundingsun light to the solar heat collector. When the solar light shines onthe solar heat collector 710, the cooking processing in each utensil isthe same as the processing as mentioned before.

Referring to FIG. 8, a set of exemplary solar heat collectors areillustrated schematically in vertical sections. FIG. 8A is a schematicvertical section view of an evacuated-tube solar heat collector filledwith liquid heat storage and conducting material, e.g. water or oil. Insome cases, besides being a heat storage and conducting material, watercan also be a heat transferring medium for food cooking. FIG. 8B is aschematic vertical section view of an evacuated-tube solar heatcollector filled with solid heat storage and conduction material, e.g.ore stone or turves. FIG. 8C is a schematic vertical section view of anevacuated-tube solar heat collector filled with sand and having a heattube or a heat conductor as the second heat conducting/transferringmaterial. FIG. 8D is a schematic vertical section view of anevacuated-tube solar heat collector filled with a combination of firstsolid heat storage and conducting material and second liquid heatconducting/transferring material, e.g. quartz sand and cooking oil. FIG.8E is a schematic partial vertical section view of a group of modularevacuated-tube solar heat collectors that mounted in a vertical parallelraw. FIG. 8F is a schematic partial vertical section view of a group ofmodular evacuated-tube solar heat collectors that mounted in ahorizontal parallel raw. When set up a solar cooking appliance, not onlythese kinds of solar heat collectors but also more kinds of theirvarieties and combinations can be selected and used. Based on abovedetailed descriptions and discussions of the samples, othermodifications will be apparent to those skilled in the art and,therefore, the invention is defined in the claims.

What is claimed is:
 1. A set of solar cooking appliances, comprising: asolar heat collector to collect and store solar heat; a first solid heatstorage and conducting material filled in the solar heat collector,wherein said solar heat collector heats said first solid heat storageand conducting material to a temperature higher than the water boilingtemperature; a solar cooking range/stove having a heat insulated andenclosed compartment and a cooktop covering top surface of said solarcooking range/stove, a third solid heat storage and conducting materialfilled in the heat insulated and enclosed compartment of said solarcooking range/stove, and said solar cooking range/stove thermallyconnected with said solar heat collector to receive and store solar heatfor food cooking; a set of cooking chambers arranged in said enclosedcompartment and located in said third solid heat storage and conductingmaterial; a second heat-transferring/conducting material thermallyconnected said solar heat collector to said third solid heat storage andconducting material within said solar cooking range/stove; a set ofcooking utensils with heat insulated covers, said cooking utensilslocated in the cooking chambers of said solar cooking range/stove; a setof removable parts for covering said cooking chambers; a set of removalparts for inserting said cooking chambers; and an electric power heaterarranged in said range/stove to provide a backup energy source andelectric heat storing.
 2. The solar cooking appliance according to claim1, wherein said solar heat collector is selected from a group of: asolar heat collector having one open end; an solar heat collector havingtwo open ends; an evacuated-tube solar heat collector; a plurality ofevacuated solar heat collector; a plurality of modular evacuated-tubesolar heat collectors; an evacuated-tube solar heat collector having oneopen end; an evacuated-tube solar heat collector having two open ends; asolar heat collector having one open end extended into the solar cookingrange; and a solar heat collector having two open ends extended into thesolar cooking range/stove.
 3. The solar cooking appliance accordingclaim 1, wherein said first and third solid heat storage and conductingmaterial is selected from the group of: a solid chemical heat storagematerial; a solid phase change material; an ore; a metal; a sand; asalt; a soil; a quartz sand; a basalt sand; a CaO; a solid multi-waterchemical; a paraffin; a turves; a graphite; plumbaginous paraffin(graphite and paraffin); and a hybrid combination material of abovementioned materials.
 4. The solar cooking appliance according to claim1, wherein said second heat transferring/conducting material is selectedfrom the group of: a solid material; a liquid; the first solid heatstorage and conducting material; an internal wall of said solar heatcollector; an internal wall of said solar cooking range/stove; a heattube; a heat tube with conductive fins; a metal conductor; a copperconductor; an aluminium conductor; an oil; a cooking oil; a colza oil; abean oil; a petroleum oil; a heating oil; a high pressured water; asolid heat storage and conducting material with few liquid; an airtightreservoir containing a liquid and located in said solar heat collector,a liquid conduit having a first end and a second end, and said first endis extended into said airtight reservoir and submerged into said liquid,and said second end is inserted into said solar cooking range/stove, andsaid liquid is a high pressured water or an oil; an airtight reservoircontaining a liquid and located in said solar heat collector, a liquidconduit having a first end and a second end, and said first end isextended into said airtight reservoir and above surface of said liquid,and said second end is inserted into said solar cooking range/stove, andsaid liquid is a high pressured water or an oil; a heat exchanger in thesolar cooking range/stove; and a hybrid combination material of abovementioned materials.
 5. The solar cooking appliance according to claim1, wherein said solar cooking utensil is selected from a group of: anutensil having a wall connected to the second and/or third heat storageand conducting material, an utensil sized to fit the size and shape ofsaid cooking chamber in the solar cooking range/stove; a utensil made ofa material selected from the group of a metal, a glass, a ceramic, aplastic, a synthetic material, a plant fibre, a stainless steel and ahybrid combination of above mentioned materials; a coffee maker; anelectric drip coffee maker comprising an one way valve for directing asolar heated water flow and a water conduit connected the drip coffeemaker with the solar heat collector; a tea maker; a heat insulatedelectric power cooking utensil; a heat insulated electric power cookingutensil with operating parameter measuring indicating and controllingdevises and/or system; a bag made of a material selected from the groupincluding a metal, a paper, a plastic, a synthetic material, a plantfibre and any hybrid combination of these materials; a membrane/foil forwrapping or covering a food for solar cooking, a perforated basket forsteam cooking a food; a fryer with a wire mesh for frying and drain afood; a whisker net to press the food sheet close to an internal wall ofsaid utensil for food roasting and baking; a wok/pot wherein food andwater are arranged for a food braising or boiling; a pan wherein one ormore small frying pan(s) in parallel suspended in the utensil for fry,saute or brown a food; a utensil having a lower part and a upper part,wherein said lower part is sized to fit a shape and size of said cookingchamber and the upper part having a heat insulated greatcoat; an utensilhaving a two layer toughness glass lid; an utensil having a heatconductive coat sized to fit the size and shape of the solar cookingchamber; and an utensil having a heat insulated coat sized to fit theinner size and shape of the solar cooking chamber.
 6. The solar cookingappliance according to claim 5, wherein the membrane/foil for wrappingor covering a food for solar cooking is made of a material selected fromthe group of; a metal; a paper; a plastic; a synthetic material; aglass; a plant fibre; and any hybrid combination of these materials. 7.The solar cooking appliance according to claim 1, further comprises anaccessory selected from the group of: a fixing and supporting trestlefor arranging and supporting each part of the solar cooking appliancesat a proper position, and said trestle further comprising one or more ofa structure allowing the adjustment of an incidence angle of the solarheat collector to a sun light; a light reflecting object to focus asurrounding sun light to the solar heat collector; a sundial attached tothe solar heat collector perpendicularly for showing the angle of thesun light; a suitcase wherein the elements of the solar cookingappliances are arranged and packaged to form a portable solar cookingappliance; an electric power heater with a measuring and indicatingdevise for operation parameter selected from a group of temperature,timing, pressure, moisture; an electric power heater with a measuringand controlling system; an airtight reservoir containing a liquid andlocated in the chamber, a liquid conduit having a first end and a secondend, and said first end is extended into said airtight reservoir andsubmerged into said liquid, and said second end is inserted into anutensil, and said liquid is either a water or a cooking oil; an airtightreservoir containing a water and located in the chamber, a conduithaving a first end and a second end, and said first end is inserted intosaid airtight reservoir and positioned above said water, and said secondend is extended into a cooking utensil; a hot water/steam tube withinthe first solar heat storage and conducting material; a transparentprotective cover protecting said evacuated tube solar heat collector forsafety reason; a transparent plastic protective mantle protecting saidevacuated tube solar hear collector; and a heat conductive coat havingfirst side connected to the external side of the utensil and second sideto the chamber wall of the solar cooking range/stove.
 8. The solarcooking appliance according to claim 1, wherein said solar cookingrange/stove further comprises an accessory selected from the group of: astructure for connecting the cooking range/stove with the heattransferring medium; a heat exchanger arranged in said enclosedcompartment of said solar cooking range/stove and surrounded by saidthird solid heat storage and conducting material, said heat exchangerhaving an end connected to the fitting on a wall of said cookingrange/stove for receiving the solar heat from the solar heat collector;a heat insulated coating on the surface of said enclosed compartment; aremovable heat insulation greatcoat; a structure for breathing andexpansion of the second heat-transferring/conducting material withinsaid enclosed compartment of the solar cooking range/stove; a receivingfitting for receiving a heat tube from the solar heat collector; achamber enclosed by a heat conductive material for separating said thirdsolid heat storage and conducting material from the cooking utensil; amodular standard chamber with a modular standard utensil; an oven with adoor enclosed by a heat conductive material and surrounded by said thirdsolid heat storage and conducting material; a set of modular standardsize cooking chambers; and an enclosed compartment made of a materialselected from the group of: a metal, a plastic, a synthetic material, aceramic, a concrete, a brick, a stone, a wood, a bamboo, a soil, asteel, a copper, an alloy, a stainless steel, an aluminium alloy, andany hybrid combination of these materials.
 9. The set of solar cookingappliances according to claim 1, further comprising a heat conductivecoat sized to fit its inside size and shape with the outside size andshape of said utensil, and its outside size and shape with the insidesize and shape of said standard module cooking chamber.
 10. The set ofsolar cooking appliances according to claim 1, further comprising a heatinsulated coat sized to fit its inside size and shape with the outsidesize and shape of said utensil, and its outside size and shape with theinner size and shape of said standard module cooking chamber in saidsolar cooking range.
 11. The set of solar cooking appliances accordingto claim 1, wherein said first solid heat storage and conductingmaterial and said third solid heat storage and conducting materialconsist of the same material.
 12. The set of solar cooking appliancesaccording to claim 1, wherein said first solid heat storage andconducting material and said third solid heat storage and conductingmaterial comprise different materials.